Abstract
The paper demonstrates passively Q-switched erbium-doped fiber laser implementing multiwalled carbon nanotubes (MWCNTs) based saturable absorber. The paper is the first to report the use of the MWCNTs with diameter less than 8 nm as typically, the diameter used is 10 to 20 nm. The MWCNTs is incorporated with water soluble host polymer, polyvinyl alcohol (PVA) to produce a MWCNTs polymer composite thin film which is then sandwiched between two fiber connectors. The fabricated SA is employed in the laser experimental setup in ring cavity. The Q-switching regime started at threshold pump power of 103 mW and increasable to 215 mW. The stable pulse train from 41.6 kHz to 76.92 kHz with maximum average output power and pulse energy of 0.17 mW and 3.39 nJ are produced. The shortest pulse width of 1.9 μs is obtained in the proposed experimental work, making it the lowest pulse width ever reported using MWCNTs-based saturable absorber.
Highlights
As an alternative to solid state laser, ultrafast fiber laser has been the centre of attention these past few years
A paper reported by Kasim et al [9] utilizes Multiwalled carbon nanotubes (MWCNTs)-polyethylene oxide (PEO) composite as Saturable absorber (SA) in 1 micron region, yielding a maximum of 24 kHz repetition rate and 143.5 nJ of pulse energy operating at central wavelength 1060.2 nm
Ahmad et al [3] resides the same MWCNTs-PEO based SA in Erbium-Doped Fiber laser (EDFL), producing a stable pulse train with repetition rates ranging from 4.5 kHz to 20.0 kHz as well as maximum pulse energy of 15.3 nJ and shortest pulse width of 8.8 μμs
Summary
As an alternative to solid state laser, ultrafast fiber laser has been the centre of attention these past few years. Following the increased interest in carbon nanotubes, many works have been reported on MWCNT-based passive saturable absorber demonstrating different laser performance in Q-switched regime. A paper reported by Kasim et al [9] utilizes MWCNTs-polyethylene oxide (PEO) composite as SA in 1 micron region, yielding a maximum of 24 kHz repetition rate and 143.5 nJ of pulse energy operating at central wavelength 1060.2 nm. Ahmad et al [3] resides the same MWCNTs-PEO based SA in Erbium-Doped Fiber laser (EDFL), producing a stable pulse train with repetition rates ranging from 4.5 kHz to 20.0 kHz as well as maximum pulse energy of 15.3 nJ and shortest pulse width of 8.8 μμs. A 1.9 μs of pulse width is produced, which is the shortest ever reported using MWCNTs based passive saturable absorber. The results may be caused by the diameter of the MWCNTs used as the diameter of the carbon nanotubes play an important role in the SA’s absorption characteristics during laser generation [12,13]
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